DETROIT ? As Kmart Corp. investigates the circumstances that led it to file for bankruptcy court protection, the discount chain is examining its employees’ travel records.

Kmart has subpoenaed an undisclosed number of its former employees, searching for information about the possible wrongdoing of its previous management.

Kmart has been secretive in recent months about the progress of its stewardship review, but a U.S. Bankruptcy Court filing by former Kmart division president William Wulfers last week revealed some details, the Detroit Free Press reported in Wednesday’s editions.

Wulfers was one of 25 executives who received $28 million in forgivable loans from the company only months before the retailer sought bankruptcy protection. He received a $750,000 loan in December and left the company in May.

Wulfers’ attorneys on Friday filed a response and objection to seven questions in Kmart’s subpoena.

Kmart operates a distribution center and store in Lawrence.